Hydrolysis of benzamide with sodium hydroxide solution will give sodium benzoate and ammonia. This will have a different crystal structure from the acid.
There is a procedure for hydrolysis of amides by dissolving them in sulphuric acid then poring the solution into water. I've never tried it but it should make the acid directly.

Yes, after boiling with NaOH ,suction filtration is then carried out ,then excess HCl is added to the yellow ppt. .Finally the mixture is dissolved in HOT water(recrystallization).Then the solid obtained is Needle-like .

I would like to ask if the yellow ppt. is sodium benzoate and why the benzoic acid is Needle-like .By the way ,will there any side product be formed ?

I think the reason of carring out alkaline hydrolysis is to shift the equilbrium to the right in order to obtain more crystals since NH3 can be esaily removed, but i am not sure if i am right.